Difference between revisions of Diopters

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(Expanded definition)
Line 1: Line 1:
0.00 - 0.75 - Probably don't need glasses
+
Diopters is a measure of the power of a [[lens]] (or mirror). It is equal to 1/[[focal length]] in meters.  In EM we refer to the [[cm measurement]] to calculate diopters needed to correct [[refraction]] of the eye.
  
1.00 - 2.00 - Mild myopia, no [[differentials]] needed
+
A lens with a negative diopter sign compensates for [[nearsightedness]] while a lens with a positive diopter sign compensates for [[farsightedness]]
  
2.00 - 5.00 - Moderate myopia, glasses always needed
+
Approximate categorizations of myopia by lens power:
  
5.00 - 10.00 - High myopia
+
0.00 - -0.75 - Probably don't need glasses
  
10.00+ - Very high myopia. Field of view significantly reduced.
+
-1.00 - -2.00 - Mild myopia, no [[differentials]] needed
 +
 
 +
-2.00 - -5.00 - Moderate myopia, glasses always needed
 +
 
 +
-5.00 - -10.00 - High myopia
 +
 
 +
-10.00+ - Very high myopia. Field of view significantly reduced.

Revision as of 19:22, 18 May 2020

Diopters is a measure of the power of a lens (or mirror). It is equal to 1/focal length in meters. In EM we refer to the cm measurement to calculate diopters needed to correct refraction of the eye.

A lens with a negative diopter sign compensates for nearsightedness while a lens with a positive diopter sign compensates for farsightedness

Approximate categorizations of myopia by lens power:

0.00 - -0.75 - Probably don't need glasses

-1.00 - -2.00 - Mild myopia, no differentials needed

-2.00 - -5.00 - Moderate myopia, glasses always needed

-5.00 - -10.00 - High myopia

-10.00+ - Very high myopia. Field of view significantly reduced.